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Oracle Distributed Systems

Any organization that uses the Oracle relational database management system (RDBMS) these days needs to use multiple databases. There are many reasons to use more than a single database in a distributed database system:

  • Different databases may be associated with particular business functions, such as manufacturing or human resources.
  • Databases may be aligned with geographical boundaries, such as a behemoth database at a headquarters site and smaller databases at regional offices.
  • Two different databases may be required to access the same data in different ways, such as an order entry database whose transactions are aggregated and analyzed in a data warehouse.
  • A busy Internet commerce site may create multiple copies of the same database to attain horizontal scalability.
  • A copy of a production database may be created to serve as a development test bed.
In a distributed database environment, data in two or more databases is accessible as if it were in a single database. Usually, the different databases are on different servers, which may be located at the same site or a continent away. Communication between the servers takes place via SQL*Net (for Oracle7) or Net8 (for Oracle8). Distributed database environments offer a number of benefits over single- database systems, including:
  • Tunability
  • Platform autonomy
  • Fault tolerance
  • Scalability
  • Location transparency
  • Site autonomy
This book describes how you can use multiple databases and the distributed features of Oracle to best advantage. It covers: Table of contents: Part I: The Distributed System
  • Introduction to Distributed Database Systems
  • SQL*Net and Net8
  • Configuration and Administration
  • Distributed Database Security
  • Designing the Distributed System
  • Oracle's Distributed System Implementation
  • Sample Configurations 8. Engineering Considerations
Part II: Replication
  • Oracle Replication Architecture
  • Advanced Replication Option Installation
  • Basic Replication
  • Multi-Master Replication
  • Updateable Snapshots
  • Procedural Replication
  • Conflict Avoidance and Resolution Techniques
Part III: Appendixes Appendix A: Built-in Packages for Distributed Systems Appendix B: Scripts